API Text View has the constants you need.

#DEFINE THREAD_BASE_PRIORITY_MIN -2
#DEFINE THREAD_PRIORITY_LOWEST THREAD_BASE_PRIORITY_MIN

For VC++ users, it is in the WINNT.H include file.

>>>Hi All,
>>>
>>>I need to programmatically minimize the DOS application window and set its priority to low from VFP app. I assume I can do it with SendMessage() API function. Any body knows the constants I should use for that?(or better the exact syntax :)
>>
>>What is "the DOS application window"? Are you running a separate program from Visual FoxPro? If so, you can call a separate program, without opening a DOS prompt, just with RUN /n.
>>
>>Hilmar.
>
>Hi Hilmar,
>
>Yes, my VFP app runs FoxPro 2.5 DOS app with RUN /N1 ... command.
>But then I need to minimize that FP DOS window and set its priority to low. (analog to DOS command
>
>START /MIN /LOW foxprox.exe myprog.fxp )
>
>I have the window handle and its Thread Process Id.
>I found out that to set priority to low I can use SetThreadPriority() API function with THREAD_PRIORITY_LOWEST constant but I can't find that constant value and can't find the .H file to see how it is declared.